Docs: Update README with new feature showcase screenshots

[VariableThe]

Replaces the older, fragmented screenshots with three beautiful, comprehensive full-bleed screenshots demonstrating the new features (Math, Variables, Tasks, Code Snippets, Colors, and AI).

Summary by CodeRabbit

• Documentation
  • Updated the Screenshots section in README with new demo images.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 76b010c8-6541-4769-8023-5b4a94ad8dec

📥 Commits

Reviewing files that changed from the base of the PR and between b381cdb and e067332.

⛔ Files ignored due to path filters (15)

• Screenshots/ai-demo.png is excluded by !**/*.png
• Screenshots/basics.png is excluded by !**/*.png
• Screenshots/demo-1.png is excluded by !**/*.png
• Screenshots/demo-2.png is excluded by !**/*.png
• Screenshots/demo-3.png is excluded by !**/*.png
• Screenshots/editor-formatting.png is excluded by !**/*.png
• Screenshots/folders.png is excluded by !**/*.png
• Screenshots/formats-colors.png is excluded by !**/*.png
• Screenshots/graph-view.png is excluded by !**/*.png
• Screenshots/knowledge-management.png is excluded by !**/*.png
• Screenshots/markdown-code.png is excluded by !**/*.png
• Screenshots/search.png is excluded by !**/*.png
• Screenshots/tags.png is excluded by !**/*.png
• Screenshots/variables.png is excluded by !**/*.png
• Screenshots/welcome.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The "Screenshots" section in README.md is updated by removing five existing screenshot image entries (editor formatting, inline AI, knowledge management, search, graph view) and replacing them with three new demo images: demo-3.png, demo-2.png, and demo-1.png.

Changes

README Screenshots Replacement

Layer / File(s)	Summary
Replace screenshot images in README README.md	Removes five old screenshot references and inserts three new demo image entries (demo-1.png, demo-2.png, demo-3.png) with updated alt text.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 Hop, hop, the old screens are gone,
Three shiny demos now carry on!
demo-1, demo-2, demo-3 in a row,
A fresh new README puts on a show.
The rabbit approves — off I go! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating README documentation with new feature showcase screenshots to replace outdated ones.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-screenshots

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